Abstract
Abstract The objective of this work was to assess the genetic control of tolerance to thermoinhibition in lettuce (Lactuca sativa) seeds. Seeds of the F1, F2, and F2:3 generations derived from the cross between cultivars Everglades (tolerant to thermoinhibition) and Verônica (sensitive to thermoinhibition) were used, besides seeds from the parents. Seed germination tests were conducted in a completely randomized design, with four replicates of each parent, eight of F1, and four of each of the 26 F2:3 progenies. The mean of the F2 population was considered as the mean of the sample of the 26 progenies. The genetic control of thermoinhibition tolerance in lettuce seeds is attributed to one or a few genes. The additive effects are more expressive than the nonadditive ones, and narrow-sense heritability is relatively high, allowing the prediction of success in selection.
Highlights
Lettuce is a leafy plant of great economic importance in Brazil and is cultivated in almost all the regions of the country (Silva et al, 2019)
Initially, the F-test of the analysis of variance showed differences among the genotypes at 1% probability, confirming variability for the trait thermoinhibition tolerance in seeds – germinated at 35oC – of the Everglades and Verônica lettuce cultivars and of the generations derived from the cross between them (Table 1)
When the additive effects for a trait are high in a given cross, the mean of the parents does not differ from that of the progeny, differently from the results found in the present work
Summary
Lettuce is a leafy plant of great economic importance in Brazil and is cultivated in almost all the regions of the country (Silva et al, 2019). Germination problems can cause poor quality seeds and a delay in. In interparietal crosses between contrasting genitors, it is possible to identify hybrids by phenotypic characters, this is better observed in adult plants (Silva et al, 2005). In lettuce, it is difficult to ensure seeds derived from backcrosses, since these generations have intermediate phenotypic characteristics. In this case, the option is usually to use seeds of F2:3 progenies to confirm F2 segregation (Carvalho Filho et al, 2011)
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